River erosion processes.
Hydraulic action- The force of the water hitting the banks and bed.
Abrasion- When the load of the river is repeatedly hitting the bed and banks causing material to break off.
Attrition- When stones and boulders knock against eachother and cause bits to fall off so that they reduce in size.
Solution- Occurs when rivers flow on certain rock typs such as chalk and limestone, these are soluble in rainwater and are dissolved by the river.
Processes of transportation.
Traction- Moving the largest material; e.g boulders are rolled along.
Saltation- bouncing of small material such as small stones and grains of sand.
Suspension- very fine material floating in the water as it moves.
Solution- dissolved load.
Long and changing cross profiles
Waterfalls and gorges.